This tool lets you simulate keyboard input and mouse activity, move and resize
windows, etc. It does this using X11's XTEST extension and other Xlib
functions.
Additionally, you can search for windows and move, resize, hide, and modify
window properties like the title. If your window manager supports it, you can
use xdotool to switch desktops, move windows between desktops, and change the
number of desktops.